Metal joist



Dea 29, 1991. Ew REBMAN' 1,899,178 l METAL JoIsT Filed oct. 17, 19129Patented Dec. 29, 1931 UNITED STATES orsi-ion ELIVIER W. REBMAN, OFBUFFALO, NEW YORK, ISEIGNOR `21.*() :'CXBNTRIACTORS ORNAr- LIENTAL STEELCO. INC.,`OF BUFFALO, NEW YORK, A CORPORATION OF .NEW YORK 'METAL-.dorstApplication med october 17.1.1929..sem1;1p.v4oo,32a.

This invention relates to a metal joist construction. y

The invention comprehends the provision of a metal joist having upperand lower chord members, tension members extending diagonally betweenthese chord members and' compression bars connecting the chord membersand retaining the tension members in assembled relation therewith, inwhich the special construction of the tension members and the chordmembers provides for the use of reduced ends on the compression 'barsadapted to extend through registering openings in the tension and chordmembers so that the swaging of the reduced ends of the compression barswill rigidly assemble these parts together.

In the drawings:

Fig; 1 shows the joist member in perspective.

Fig. 2 is a sectional vview taken on line 2-2 of Fig. 1.

Fig. 3 is a sectional view taken on line 3-3 of Fig. 2. f

Fig. 4 is a sectional view taken on line 4 4 of Fig. 1.

Fig. 5 is a plan view showing the connections between the tension andcompression members and the upper chord.

Fig. 6 is a perspective of an end of one of the compression rods.

The upper chord 1 consists of a straight channel bar having spacedopenings 2 therein, said openings being elongated in one direction andhaving arcuate ends. The openings 2 are countersunk orchamfered at theupper side of the chord 1 as indicated at 3 in Fig. 3.

The lower chord 4 formed of a channel bar Y is spaced from the upperchord and is provided with a central portion 5 and end portions 6,offset lfrom said central portion. The portions of bar joining the ends6 with the central portion 5 are inclined as shown in Fig. 1. rilhelower chord 4 has a plurality7 of spaced openings aligned with openings2 in the upper chord, and having countersunk portions at the lower faceof the chord. The flanges on the upper and lower chords extend towardeach other as shown in Fig. 1.

Ajplnralityof"tensionibars are mounted between'thecentraliportion '5 ofthe lower andthe oppositegpart of the upper chord. These bars vinclude acentral tension "bar having "anintermediate 'foot portion'.Sfbetweenf'the diagonal Nportions Qwhile foot portions"areV provided4at the .ends of portions?. The'foot portion 8 is positionedagainst'theinner Itace ofthe lower chord and thas Aan 'opening inregistry with one of the openings thereimfwhile the end "foot por-"tions seat'againstthe upper chord and have openings registering Wviththe vopenings Athereinfat opposite sides of the opening in alignmentwith the foot portion "8. Tension '.barsllprovided'with foot portions 12on opposite ends eXtendbetween the upper and .lower hords atoppostesides oflportions9 :off bar7 and arearranged in parallel relationtheretoa'lthefbarsll at'one side ofbar 7 extendinginfonedirection andthe'barsll at 'the other side ofban'? extending in an angu-.lardirection butparalleltothe adjacent por- 4`tion').v Ink each casethe Jootportions 12 are seated against the chords `an'd'h-ave openings=1egistering with Vopenings in the chords.

.Compression .rods 13 extend between the npperandllower chords insubstantially perl,pendiclilar 4relationand have'vreduced or recessed.ends 14extendingthrough the registeringopeningsin the` foot portions ofthe gtension'barsand the chords. y'These/ends .1.4

,arezswaged'into :the -countersunk portions of the openingsinthe chordsfor rigidly: assemblingthe chordsj .tension bars and compression rods.vThe rods have shoulders 'f1-5 adjacent lthereduced ends `which engagethe .footportions and cooperate yto vretain them lagainst the-chordsywhen the reduced ends are swaged soi-thatgarigi-dxstructure .isobtained n lwhich `.the @tension bars and cornpressionirods have stressdistributing-cooperation ,with the` chords. g

The opposite ends of chord 1- and theloi'- Set-pnds'of ohord'llfaresecured together by connecting plates 16. For this purpose plates 16 areprovided with projections 17 extending through openings 18 in the chordsand have their ends swaged into the countersunk portions to permanentlysecure the parts together. The plates 16 are provided With openings 19for use in mounting the .joists in position for use.

From the foregoing description it Will be seen that a joist constructionis provided by this invention which comprises only three essential partsin which the compression rods perform a plurality of functions insecuring an assembled structure Which is rigidfeco# nomical tomanufacture, and eiiicient in ,use-j.

That is claimedis: -e 1. An article of manufacture providing a metaljoist, comprising a substantially??-4 straight elongated bar forming anupperw chord member, a lower chord member' formed" of a bar having theends offset relative to the central portion, connectingplatesbetvveenthe offset ends of the lower chord member and the ends of the upperkchord member having the opposite edges secured to the bars forming saidmembers, tension bars extending in diagonal relation betvveenvthercentral portions of the lower chord member and the yupper chordmember, each tension bar having angularly` extending foot portionsseated against said chord 'members and provided with openings inregistry with openings in said chord members, compressionrods havingreduced extensions on opposite ends, said A rods being mounted insubstantially perpendicular relation between said chord mem'- bers andhaving shoulders formed byfsaid reduced ends seated against said footportions, said reduced lportions lextending through said registeringopenings and having swaged terminals'for permanently securing said rods,bars and chord'imem'bers in assembled relation. e Y i` k 2. A metaljoist comprising, an Vupper chord member, a lower chord member in spacedrelation thereto, tension members having foot portions seated againstsaid chord members and diagonally disposed portions extending betweensaid chord members, the ioot portions of said tension members beingprovided With openings inregistry with openings in saidchord'membersgand compression rods extending betvveenrsaid chordmembers` in substantially perpendicular relation thereto, said rodshaving in;- tegral shoulders bearing on the foot portions of saidtension members, having a subst'a'rb tially uniform section in theplane'of said chords with end portions extendingthrough the registeringopenings in said foot portions and chordsgand provided with swagedterminals Yto completely lill said openings and 'permanently secure saidrods, tension members and chord members in rigid assembled rela-tion.

ELMER' W. REBMAN. f

